Ink cartridge and ink-jet recording apparatus

Abstract

 An ink cartridge has pivotable levers (8, 9) on walls of a container (2), pawls (12,13) on the levers, and protruded guide portions (14,15) on the levers. The pawls (12,13) are engageable with an ink cartridge holder (30). The protruded guide portions (14,15) contact the ink cartridge holder (30) to move the levers (8,9) in the opening direction. Further, protruded stopper portions (16,17) are formed to permit rotational movement of the levers (8,9) to such a degree as to disengage the pawls (12,13) from the ink cartridge holder (30).

Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a recording apparatus in which an ink cartridge is loaded into a carriage to supply ink to an ink-jet recording head mounted in the carriage. The present invention also relates to an ink cartridge appropriate for such a recording apparatus.

[0002] A recording apparatus, in which an ink container is detachably mounted on a carriage mounting an ink-jet recording head thereon, includes a retaining mechanism for preventing the removal of the ink container due to the movement of the carriage during printing, and for permitting the easy removal of the ink container by an external operation.

[0003] As disclosed, for example, in JP-A-10-44451, such a retaining mechanism is arranged so that a protruded portion for engagement with an ink cartridge holder is formed on a side face of an ink tank, and a pawl is formed on a pivotable lever on the opposite side face thereof.

[0004] In a state in which the protruded portion is kept engaged with the ink cartridge holder, the opposite face is moved to rotate about the protruded portion until the pawl is engaged with the ink cartridge holder.

[0005] However, the retaining mechanism adapted to mount the ink cartridge using the rotation of the ink cartridge is not suitable for an ink container forming an ink flow path via an ink supply needle communicating with a recording head.

[0006] That is, since the ink supply needle has a predetermined length enabling it to surely communicate with an ink container, the ink supply needle may be broken upon the application of an external force in a direction other than the axial direction. Thus, the ink container must be moved parallel to the longitudinal (axial) direction of the ink supply needle.

[0007] Further, as disclosed in JP-A-9-11500, an ink cartridge is proposed in which elastically deformable levers, each having a pawl for engagement with an ink cartridge holder, are respectively formed on two opposite faces of an ink container, so that the ink cartridge can be inserted into and connected to an ink supply needle.

[0008] In addition, especially for a recording apparatus that requires ink in which no air has been dissolved, i.e., for a recording apparatus that includes a recording head employing a piezoelectric device for pressurizing ink, an ink cartridge is held, under a pressure reduced state, by being stored within an air-impermeable film bag.

[0009] In this case, atmospheric pressure can apply great force to a lever through the bag, and the lever can be pressed against a container. If this force continues to be applied for a long period of time, creepage of the lever can occur, and the function of the lever as a fixing unit can be lost.

SUMMARY OF THE INVENTION

[0010] To resolve these shortcomings, it is one objective of the invention to provide an ink cartridge that can be inserted into or removed from an ink supply needle, and that can surely engage a pawl of a lever with an ink cartridge holder regardless of whether an external force is applied for a long period of time.

[0011] It is another objective of the invention to provide a recording apparatus appropriate for this ink cartridge.

[0012] An ink cartridge according to a preferred embodiment of the present invention has a container containing ink therein, and an ink supply port that communicates with an interior of the container and through which the ink can be supplied to a recording head when the ink cartridge is mounted onto an ink cartridge holder of a recording apparatus. A lever is formed on a wall of the container so as to be pivotable about an ink supply port side thereof. The lever has a pawl engageable with the ink cartridge holder, and a protruding guide portion to be contacted with the ink cartridge holder to pivot the lever in an opening direction.

[0013] When the ink cartridge is mounted onto the ink cartridge holder, the lever on the ink cartridge is forcibly urged outward, and the user is notified of a state that the pawl is surely engaged with the ink cartridge holder.

[0014] Further, regardless of the elasticity of the lever, the pawl on the lever is kept in engagement with the ink cartridge holder with a predetermined strength.

[0015] The present disclosure relates to the subject matter contained in Japanese patent application Nos. 2001-104526 (filed on April 3, 2001), 2001-206342 (filed on July 6, 2001) and 2001-263779 (filed on August 31, 2001), which are expressly incorporated herein by reference in their entireties.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 

Figs. 1A to 1C are a top view, a front view and a side view of an ink cartridge according to one embodiment of the invention.

Figs. 2A and 2B are perspective views of an example of an ink cartridge holder of a recording apparatus appropriate for the ink cartridge.

Fig. 3 is a cross-sectional view of the ink cartridge holder.

Fig. 4 is a diagram showing a state in which the ink cartridge is accommodated in an air-impermeable bag.

Fig. 5A is a diagram showing a state in which the ink cartridge is mounted on the ink cartridge holder, and Figs. 5B and 5C are enlarged diagrams of the area in the vicinity of a guide portion.

Fig. 6A is a diagram showing an ink cartridge according to another embodiment of the invention in a state in which it has been taken out from an air-impermeable bag; Figs. 6B and 6C are enlarged diagrams showing the area in the vicinity of struts of the ink cartridge; and Fig. 6D is a diagram showing a state in which the ink cartridge is mounted onto the ink cartridge holder.

Fig. 7A is a diagram showing an ink cartridge according to yet another embodiment of the invention in a state in which it has been taken out from an air-impermeable bag; Figs. 7B and 7C are enlarged diagrams showing the area in the vicinity of struts of the ink cartridge; and Fig. 7D is a diagram showing a state in which the ink cartridge is mounted onto the ink cartridge holder.

Fig. 8A is a diagram showing an ink cartridge according to still another embodiment of the invention in a state in which it has been taken out from an air-impermeable bag; and Fig. 8B is a diagram showing a state in which the ink cartridge is mounted onto the ink cartridge holder.

Figs. 9A to 9C are a top view, a front view and a side view of an ink cartridge according to a further embodiment of the invention.

Fig. 10 is a perspective view of an ink cartridge according to a still further embodiment of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0017] Embodiments of the invention will now be described in detail while referring to the accompanying drawings.

[0018] Figs. 1A to 1C are diagrams showing an ink cartridge according to one embodiment of the invention. An ink cartridge 1 has an ink supply port 3 that is formed in the lower face of a flat, rectangular container 2, that communicates with an interior of the container 2, and that is insertable onto an ink supply needle. Further, levers 8 and 9 are formed on side faces 4 and 5, and employ the ink supply port sides, i.e., the lower ends thereof, as rotary (pivot) portions 6 and 7. That is, in this embodiment, the levers 8 and 9 are pivotable about the portions 6 and 7, respectively. It is presently thought to be preferable to form pivot portions 6 and 7 as "living hinges", which can be formed as thinned-down portions of the lever material.

[0019] Grips 10 and 11, which can be contoured, are formed on the upper ends of the levers 8 and 9, in the middle portions of which pawls 12 and 13 are formed for engagement with an ink cartridge holder 30 of a recording apparatus, which will be described later. Further, protruding guide portions 14 and 15 are formed between the rotary portions 6 and 7 and the pawls 12 and 13. The protruding guide portion 14, 15 is urged in an opening direction A, A' while being engaged with guide portion 35, 36 of the ink cartridge holder 30 (Fig. 5). The protruding guide portion 14 is preferably shaped like a droplet in cross section so that the lower end is slightly tapered, and the other protruding guide portion 15 is circular in cross section, although other shapes could be used.

[0020] Protruded stopper portions 16 and 17 are formed at locations opposite the pawls 12 and 13 on the side faces 4 and 5 of the container 2. The protruded amount of the stopper portion 16, 17 is set to be of such a degree as to permit the movement of the lever 8, 9 toward the container 2 to disengage the pawl 12, 13 from the ink cartridge holder 30.

[0021] In this embodiment, storage means 20, in which data, such as the type of ink cartridge 1 and the volume of ink, are stored is mounted on the side face. This storage means 20 can be made from a circuit board 22 having an exposed, obverse face with electrodes 21 formed thereon and which electrodes contact the contact points of the ink cartridge holder 30 when the ink cartridge 1 is installed in the ink cartridge holder 30., A storage device (not shown) is mounted on the hidden, reverse face of the circuit board 22. Other mounting locations also couldbe employed.

[0022] Figs. 2A and 2B are diagrams showing an example of the ink cartridge holder 30 onto which the ink cartridge 1 is to be mounted, with a head unit, including a recording head 33 and an ink supply needle 34 (Fig. 3), removed. The interior of the ink cartridge holder 30 is divided into a plurality of areas by plural ribs, three ribs 31, in this embodiment. The head unit, which is shown in Fig. 3 and which includes the recording head 33 and the ink supply needle 34 (four ink supply needles 34 are provided in this embodiment) that communicate with the recording head 33, is provided in a bottom face 32. The ink supply needles 34 are located in respective areas defined by the ribs 31.

[0023] Guide portions 35 and 36, each in the form of a groove or a window, are formed in the upper portion of each of these areas for engagement with the protruding guide portions 14 and 15. The respective guide portion 35, 36 is elongated vertically to guide the protruded portion 14, 15 from a location where the protruded guide portion 14, 15 of the ink cartridge 1 is first contacted therewith to a position at which the ink supply port 3 is securely mounted on the ink supply needle 34. The guide portion 36, which is to be engaged with the protruded guide portion 15 preferably having a circular shape in cross section, is formed at its upper end with a slope 36a which is inclined toward the center of ink cartridge 1 so as to define a narrowing throat to receive the protruded guide portion 15 as it move downward regardless of the opening degree of the lever 9.

[0024] In this embodiment, in case where the ink cartridge 1 is accommodated in an air-impermeable film bag under a pressure-reduced state (less than the ambient pressure) so as to maintain the degassed state of the ink contained in the ink cartridge 1, as shown in Fig. 4, the levers 8 and 9 are pressed toward the container 2, through the air-impermeable bag, by the atmospheric pressure, but are supported by the protruded stopper portions 16 and 17 of the container 2. With this arrangement, the levers 8 and 9 are prevented from being excessively bent toward the container 2.

[0025] Accordingly, when the ink cartridge 1 is taken out of the bag, the levers 8 and 9 are opened by their own elasticity. However, there is a possibility that, due to long-time storage, the elasticity of the levers 8 and 9 may be reduced or lost, that is, the creep phenomenon may occur, to plastically deform the levers 8 and 9 to be closely contacted with or bent near to the protruded stopper portions 16 and 17.

[0026] To mount the ink cartridge 1, the levers 8 and 9 are held by the thumb and index finger, and the ink cartridge 1 is inserted into the ink cartridge holder 30 with one side face thereof located at a rear of the holder 30, i.e. the side face 4 in this embodiment, aligned parallel to a wall 30a of the ink cartridge holder 30. The position of the lever 8, formed on the side face 4, is determined by the wall 30a of the ink cartridge holder 30 and the protruded stopper portion 16 so that the protruding guide portion 14 is located closely adjacent to the guide portion 35. Further, the tapered shape of the protruding guide portion 14 makes it possible to smoothly insert the protruding guide portion 14 into the guide portion 35.

[0027] On the other hand, the protruding guide portion 15 formed on the lever 9 is guided along the slope 36a, formed on the upper portion of the guide portion 36, to enter the guide portion 36. Therefore, with the rotary portions 6 and 7 acting as fulcrums, the levers 8 and 9 are moved outward by the guide portions 35 and 36 to be separated from the protruded stopper portions 16 and 17.

[0028] Further, in the ink cartridge holder 30, second walls 30b and 30c are formed perpendicular to the wall 30a to define a gap having a width that substantially corresponds to that of the lever 8. Therefore, during the insertion of the ink cartridge 1, the lever 8 is moved along a predetermined path, while being restricted by the walls 30b and 30c in the widthwise direction.

[0029] The ink cartridge holder 30 is preferably provided with projecting identification pieces 39 that permit the insertion of only ink cartridges 1 appropriate to the respective areas of the ink cartridge holder 30. In that case, each of the ink cartridges 1 has corresponding recessed portions (not shown) that accommodate the projecting identification pieces 39 to permit the further insertion of the ink cartridge 1 only when the ink cartridge 1 is appropriate to the area.

[0030] By way of non-limiting example, an "appropriate" ink cartridge could be a cartridge of a particular color, type of ink, capacity or model. This system can be used to avoid attaching an ink cartridge of the wrong color or type of ink.

[0031] When the ink cartridge 1 is further inserted, the protruding guide portions 14 and 15 on the ink cartridge 1 are guided by the guide portions 35 and 36 of the ink cartridge holder 30 to be moved to predetermined locations, at which slopes 12a and 13a, formed on the pawls 12 and 13 of the levers 8 and 9, are brought into contact with the upper faces of engagement portions 37 and 38 of the ink cartridge holder 30 to cause a resistance against a further insertion.

[0032] When the ink cartridge 1 is further depressed in this state, as shown in Fig. 5A, the pawls 12 and 13 of the levers 8 and 9 pass over the engagement portions 37 and 38 by the presence of the slopes 12a and 13a, and snap into positions under the lower faces of the engagement portions 37 and 38. At this time, a click feeling, resulting from the elastic energy of the released levers 8 and 9, is given to a user so that the user can sense a fact that the ink cartridge 1 is correctly moved into its specified position, and the user stops an unnecessary, further depression.

[0033] In a state in which the ink cartridge 1 is mounted onto the ink cartridge holder 30, the levers 8 and 9 are constantly urged outward by the guide portions 35 and 36, so that the engagement state is maintained even when a small external force is applied to the levers 8 and 9.

[0034] In case where the ink in the ink cartridge 1 has been consumed completely, the user grips the levers 8 and 9 with the thumb and index finger to elastically deform the levers 8 and 9 about the protruded guide portions 14 and 15 supported by the guide portions 35 and 36, thereby moving the pawls 12 and 13 inward from the engagement portions 37 and 38 of the ink cartridge holder 30. When the levers 8 and 9 are pulled up in this state, the ink supply port 3 is removed from the ink supply needle 34, and the ink cartridge 1 can be detached from the ink cartridge holder 30.

[0035] In this embodiment, two levers 8 and 9 are provided on the ink cartridge 1, both for engagement with the ink cartridge holder 3. However, so long as at least the lever 8 on the side where the storage means 20 is located is provided for engagement with the ink cartridge holder 30, it is possible to maintain both the connection state between the ink cartridge 1 and the ink supply needle 34, and the reliable contact between the electrodes 21 of the storage means 20 and the contact points of the ink cartridge holder 30.

[0036] Figs. 6A to 6C are diagrams showing an ink cartridge according to another embodiment of the invention. Pawls 56 and 57 of levers 50 and 51, which are formed on side faces 4 and 5 of a container 2 in the same manner as the previous embodiment, are supported by movable struts 52 and 53, which respectively extends from the rear (inner) faces of the levers 50 and 51 to maintain appropriate separation between the pawls 56 and 57 and the side faces 4 and 5 of the container 2.

[0037] Movable struts 52 and 53 are constructed so that they can be deflected upward in order to allow the levers 50 and 51 to move. In this regard, it may be preferable to provide each strut 52 and 53 with a "living hinge" so that the struts 52 and 53 bend about the living hinge. Even more preferably, the living hinges are provided at the point where the strut meets the inner face of the lever, or at the point where at the point where the strut meets the wall of the ink cartridge 1.

[0038] Semi-circular projections 54 and 55 or "dimples" 54 and 55 are formed on the side faces 4 and 5 of the container 2 at locations to contact the distal ends of the struts 52 and 53. One or more raised rings also could be provided. Alternatively, the tips of the struts 52 and 53 could be rounded and fit into small matching depressions in the wall of the container 2.

[0039] According to this embodiment, when the ink cartridge 1 is shipped from a factory, the ink cartridge 1 is accommodated in an air-impermeable film bag under a pressure-reduced state with the struts 52 and 53 engaged with the semi-circular projections 54 and 55. Thus, since the struts 52 and 53 are held substantially perpendicular to the side faces 4 and 5, the pawls 56 and 57 on the levers 50 and 51 can be prevented from being forced inward, excessively, toward the container 2.

[0040] When the ink cartridge 1 is inserted into the ink cartridge holder 30, during the insertion process shown in Fig. 6D, unlocking projections 40 and 41, formed on the ink cartridge holder 30, push the struts 52 and 53 of the ink cartridge 1 upward. Consequently, the distal ends of the struts 52 and 53 are moved over the semi-circular projections 54 and 55 and the struts 52 and 53 are shifted upward so that they no longer limit movement of the pawls 56 and 57.

[0041] When the ink cartridge 1 is further depressed in this state, since the levers 50 and 51 are no longer supported by the struts 52 and 53, the pawls 56 and 57 pass over the engagement portions 37 and 38 by the presence of the slopes 56a and 57a, and snap outward under the lower faces of the engagement portions 37 and 38. At this time, a click feeling, resulting from the elastic energy of the released levers 50 and 51, is given to a user, so that the user can sense a fact that the ink cartridge 1 is properly moved into its specified position. Accordingly, the user stops an unnecessary further depression.

[0042] Figs. 7A to 7C are diagrams showing an ink cartridge according to yet another embodiment of the invention, in which struts 62 and 63, located behind pawls 66 and 67 of levers 60 and 61, are formed integrally with the container 2.

[0043] The pivotable struts 62 and 63 are formed on the side faces 4 and 5 of the container 2 to be substantially opposed to the pawls 66 and 67 of the levers 60 and 61.

[0044] Furthermore, semi-circular projections 64 and 65 are formed on the rear faces of the levers 60 and 61, opposed to the side faces 4 and 5 of the container 2, behind the pawls 66 and 67.

[0045] According to this embodiment, when the ink cartridge 1 is shipped from a factory, the ink cartridge 1 is accommodated in an air-impermeable film bag under a pressure-reduced state, with the free ends of the struts 62 and 63 engaged with the semi-circular projections 64 and 65 of the levers 60 and 61. Since the struts 62 and 63 are held substantially perpendicular to the side faces 4 and 5 by the semi-circular projections 64 and 65, the pawls 66 and 67 of the levers 60 and 61 cannot be forced inward toward the container 2 beyond the length of the struts 62 and 63.

[0046] When the ink cartridge 1 is inserted into the ink cartridge holder 30, during the insertion process shown in Fig. 7D, unlocking projections 42 and 43, formed on the ink cartridge holder 30, push the struts 62 and 63 of the ink cartridge 1 upward. As a result, the distal ends of the struts 62 and 63 are moved over the semi-circular projections 64 and 65, and the struts 62 and 63 are displaced upward.

[0047] When the ink cartridge 1 is further depressed in this state, since the levers 60 and 61 are free from the support of the struts 62 and 63, the pawls 66 and 67 are moved over the engagement portions 37 and 38 by the presence of the slopes 66a and 67a, and snap outward under the lower faces of the engagement portions 37 and 38. At this time, a click feeling, resulting from the elastic energy of the released levers 60 and 61 is given to a user so that the user can sense a fact that the ink cartridge 1 is properly moved to its specified position. Accordingly, the user stops an unnecessary further depression.

[0048] Fig. 8A is a diagram showing an ink cartridge according to a further embodiment of the invention. Levers 70 and 71 are formed on the side faces 4 and 5 of the container 2, and are rotatably supported at a more or less central portion along their entire length by struts 72 and 73. The lower ends of the levers 70 and 71 are free. Portions of the levers 70 and 71 below the struts 72 and 73 serve as short ribs 74 and 75.

[0049] According to this embodiment, in case where the ink cartridge 1 is accommodated in an air-impermeable film bag under a pressure reduced state, grips 78 and 79 of the levers 70 and 71 are pressed inward toward the container 2 and are deformed largely, but since the ribs 74 and 75 are short and rigid, almost no creeping occurs in the ribs 74 and 75.

[0050] When the ink cartridge 1 is depressed into the ink cartridge holder 30, as is shown in Fig. 8B, the ribs 74 and 75 of the levers 70 and 71 are first placed in contact with and guided by side walls 44 and 45 of the ink cartridge holder 30 so that the levers 70 and 71 are rotated about the roots of the struts 72 and 73 until they stand substantially upright.

[0051] Therefore, even when the grips 78 and 79 are deformed by creeping, the pawls 76 and 77 are located outside the engagement portions 37 and 38 of the ink cartridge holder 30.

[0052] Accordingly, even if the grips 78 and 79 of the levers 70 and 71 creep-deform toward the container 2 due to the storage of the ink cartridge 1 in an air-impermeable film bag under a pressure-reduced state, the pawls 76 and 77 can be securely brought in contact with the lower portions of the engagement portions 37 and 38. As a result, a click feeling, resulting from this elastic energy, is given to a user so that the user can sense a fact that the ink cartridge 1 is properly moved into its specified position. Accordingly, the user stops an unnecessary further depression.

[0053] Figs. 9A to 9C are diagrams showing an ink cartridge 1 according to a still further embodiment of the invention. In this embodiment, tab portions 82 and 83 are formed to project from the obverse surface and/or the reverse surface of a container 2 to locations in the vicinities of pawls 86 and 87 of levers 80 and 81. Further, struts 84 and 85 are formed on the tab portions 82 and 83 opposite the levers 80 and 81, so that they are positioned outside the levers 80 and 81.

[0054] According to the embodiment, in case where the ink cartridge 1 is accommodated in an air-impermeable film bag under a pressure-reduced state, the levers 80 and 81 are protected by the struts 16 and 17 as previously described, so that they are prevented from being creep-deformed toward the container 2. Also, unnecessary opening of the levers 80 and 81 can be prevented by the struts 84 and 85 of the tab portions 82 and 83.

[0055] Specifically, since the tab portions 82 and 83 and the struts 84 and 85 function as protective members for the levers 80 and 81, the pawls 86 and 87 are prevented from being deformed by colliding with others, so that the pawls 86 and 87 can securely be engaged with the ink cartridge holder 30.

[0056] Fig. 10 is a diagram showing an ink cartridge 1 according to a further embodiment of the invention. A strut 92 is formed on at least one of the levers 90 and 91 (i.e. at least on the lever 90 provided on a face of the container 2 where the storage means 20 is disposed).

[0057] The strut 92 is disposed substantially on an upper end portion, i.e. a movable free end portion, of a face of the lever 90, which face of the lever is opposed to the container 2.

[0058] According to the embodiment, even if the ink cartridge 1 is accommodated in an air-impermeable film bag under a pressure reduced state, the creep-deformation of the lever 90 is prevented by supporting the upper end of the lever 90 with the strut 92. Thus, when the ink cartridge 1 is mounted to the ink cartridge holder 30, at the least the lever 90 is not creep-deformed, so that the lever 90 is elastically deformed outward by the protruded stopper portion 16 to securely engage a pawl 93 with the engagement portion 37 of the ink cartridge holder 30.

[0059] As a result, electrodes 21 of the storage means 20 can be securely contacted with the contact points of the ink cartridge holder 30, and also the contact condition can be maintained.

[0060] As described above, according to the invention, when an ink cartridge is mounted to an ink cartridge holder, the levers on both side faces of the ink cartridge are forcibly urged outward by the ink cartridge holder. Thus, not only can a user be notified of the exact time the pawls of the levers have been securely engaged with the ink cartridge holder, but also it is possible to maintain the state in which the pawls are engaged with the ink cartridge holder with a predetermined strength regardless of the elasticity of the levers.

Claims

1. An ink cartridge having a container containing ink therein, and an ink supply port that communicates with an interior of the container and through which the ink can be supplied to a recording head when the ink cartridge is mounted to an ink cartridge holder of a recoding apparatus, the ink cartridge comprising:

a lever formed on a wall of the container so as to be pivotable about an ink supply port side thereof;

a pawl on the lever, which is engageable with the ink cartridge holder; and

a protruding guide portion to be contacted with the ink cartridge holder to move the lever in an opening direction.

2. The ink cartridge according to claim 1, further comprising:

a protruding stopper portion which permits a pivot movement of the lever to such a degree that the pawl can be disengaged from the ink cartridge holder.

3. The ink cartridge according to claim 1 or 2, wherein the protruding guide portion is formed on a side face of the lever.

4. The ink cartridge according to any one of claims 1 to 3, wherein a lower end side of the protruding guide portion is tapered.

5. An Ink-jet recording apparatus adapted to receive ink from an ink cartridge having a container containing the ink therein, an ink supply port that communicates with an interior of the container, a lever formed on a wall of the container so as to be pivotable about an ink supply port side thereof, a pawl on the lever, and a protruding guide portion for moving the lever in an opening direction, the apparatus comprising:

an ink cartridge holder onto which the ink cartridge is mountable;

a vertically extending guide portion, formed in the ink cartridge holder, for engagement with the protruding guide portion to move the lever in the opening direction.

6. The ink-jet recording apparatus according to claim 5, wherein the guide portion is substantially in the form of a groove or a window, and has a sloped upper end.

7. An ink cartridge having a container containing ink therein, and an ink supply port that communicates with an interior of the container and through which the ink can be supplied to a recording head when the ink cartridge is mounted to an ink cartridge holder of a recoding apparatus, the ink cartridge comprising:

a lever formed on a wall of the container so as to be pivotable about an ink supply port side thereof;

a pawl on the lever, which is engageable with the ink cartridge holder; and

a movable strut supporting the pawl of the lever.

8. The ink cartridge according to claim 7, wherein the movable strut is formed on the wall of the container.

9. An ink-jet recording apparatus adapted to receive ink from an ink cartridge having a container containing the ink therein, an ink supply port that communicates with an interior of the container, a lever formed on a wall of the container so as to be pivotable about an ink supply port side thereof, a pawl on the lever, and a movable strut supporting the pawl of the lever, the apparatus comprising:

an ink cartridge holder to which the ink cartridge is mountable; and

a projection, formed in the ink cartridge holder, that contacts the strut to cause the strut to pivot and be displaced.

10. An ink cartridge having a container containing ink therein, and an ink supply port that communicates with an interior of the container and through which the ink can be supplied to a recording head when the ink cartridge is mounted to an ink cartridge holder of a recoding apparatus, the ink cartridge comprising:

a lever formed on a wall of the container, the lever having a strut at its substantially central portion, about which the lever is pivotable; and

a pawl on the lever, which is engageable with the ink cartridge holder.

11. An ink-jet recording apparatus adapted to receive ink from an ink cartridge having a container containing the ink therein, a lever formed on a wall of the container and provided at its substantially central portion with a strut about which the lever is pivotable, and a pawl on the lever, the apparatus comprising:

an ink cartridge holder to which the ink cartridge is mountable;

a face, formed in the ink cartridge holder, for contact with a lower region of the lever below the strut.

12. The ink cartridge according to any one of claims 1 to 4, 7, 8 and 10, further comprising:

a tab portion, formed in the container, for covering a side face of the lever; and

a protective member in the form of a strut, which is provided on the tab portion for restricting the lever from opening outwardly.

13. The ink cartridge according to any one of claims 1 to 4, 7, 8, 10 and 12, further comprising;

a strut on a movable free end portion of a face of the lever, the face of lever opposing the container.

14. The ink cartridge according to any one of claims 1 to 4, 7, 8, 10, 12 and 13, wherein the lever is formed on each of two opposite walls of the container.

Drawing